Title :
Rapid acquisition of PN sequences with a new decision logic
Author :
Lee, Jung Hoon ; Song, Iickho ; Park, So Ryoung ; Lee, Jumi
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA
Abstract :
In this paper, a fast acquisition scheme of pseudonoise (PN) sequences for direct-sequence spread-spectrum systems is proposed. The scheme exploits a new decision logic not only to estimate chip values, but also to check the reliability of the chip estimates. As a result, the internal state of a PN sequence generator is estimated more accurately. We derive the probability of finding a correct state estimate and show that the proposed scheme can reduce the average number of chips for acquisition when compared with the conventional scheme. It is also shown that the performance improvement is more noticeable in the moderate signal-to-noise-ratio range.
Keywords :
decision theory; majority logic; probability; pseudonoise codes; sequential estimation; spread spectrum communication; state estimation; synchronisation; PN sequences; chip value estimation; decision logic; direct sequence spread spectrum system; probability; pseudonoise sequence; rapid acquisition; reliability; signal-to-noise ratio; state estimation; Correlators; Costs; Hardware; Logic; Matched filters; Sequential analysis; Shift registers; Signal to noise ratio; Spread spectrum communication; State estimation;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2003.819813
